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- 1. Multiple Choice
The diagram shows the mechanism of an enzyme.
What is X?
Enzyme
Product
Substrate
Enzyme-substrate complex
- 2. Multiple Choice
The diagram shows the action of an enzyme on a substrate.
Which of the following is represented by P?
Product
Substrate
Enzyme-substrate complex
Stable intermediate substance
- 3. Multiple Choice
Diagram shows a molecule of an enzyme.
Which of the followings show the substrate for this enzyme?
- 4. Multiple Choice
A housewife accidentally cut her finger and her blood stained her shirt.
Her husband bought a box of washing powder with enzyme.
Which of the followings is the most suitable enzyme and water temperature to remove the blood stain?
Lipase, 37oC water
Protease, 37oC water
Amylase, 37oC water
Protease, 18oC water
- 5. Multiple Choice
Diagram shows the effect of substrate concentration on the rate of enzyme reaction.
What causes the rate of reaction at point X to Y?
Free active sites
Maximum rate of reaction
Limited enzyme concentration
Decrease in pH of the substrate
- 6. Multiple Choice
A daughter need to prepare a meat dish in less than an hour after come back from work.
Which of the followings is the best step to treat the meat before cooking?
Marinate with lipase
Marinate with rennin
Marinate with protease
Marinate with amylase
- 7. Multiple Choice
Diagram below shows an enzyme reaction.
Which of the followings represent X, Y and Z?
X:enzyme, Y:product, Z:substrate
X:product, Y:enzyme, Z:substrate
X:substrate, Y:enzyme, Z:product
X:substrate, Y:product, Z:enzyme
- 8. Multiple Choice
The equation shows the hydrolysis of sucrose.
What is represented by P, Q and R?
P:sucrase, Q:glucose, R:glucose
P:amylase, Q:maltose, R:glucose
P:sucrase, Q:fructose, R:glucose
P:sucrase, Q:galactose, R:glucose
- 9. Multiple Choice
Diagram shows the experiment to study the effect of pH on the reaction of an enzyme.
Which test tubes remain cloudy after 60 minutes?
P and Q
R and S
Q and S
P and R
- 10. Multiple Choice
Diagram shows a petri dish with agar jelly containing starch.
Four holes were cut in the jelly and each hole was treated differently.
After 30 minutes, iodine solution was poured over the jelly.
Which holes, A, B, C or D would be surrounded by the largest yellowish brown region?
A
B
C
D
- 11. Multiple Choice
Which is the most effective washing for a t-shirt with grease stain?
Detergent containing lipase with 37oC water
Detergent containing protease with 37oC water
Detergent containing amylase with 37oC water
Detergent containing pectinase with 37oC water
- 12. Multiple Choice
What is the product from the catalysis of cellulose by cellulase?
glucose
galactose
amino acid
glucose and galactose
- 13. Multiple Choice
Diagram shows the action of enzyme to form a disaccharide.
What is S and T?
S:galactose, T:maltose
S:glucose, T:sucrose
S:galactose, T:sucrose
S:glucose, T:maltose
- 14. Multiple Choice
Lipase solution was added to milk. After 30 minutes the pH of the milk decreases.
What is the substrate and product in this reaction?
Substrate:fat, Product:amino acid
Substrate:protein, Product:amino acid
Substrate:fat, Product:fatty acid
Substrate:protein, Product:fatty acid
- 15. Fill in the Blank
Diagram shows the action of lactase on substrate P to form glucose and R.
Name R.
- 16. Multiple Choice
Based the diagram, what are the two correct characteristics of lactase?
structure of enzyme is unchanged
has active site for specific reaction
needs co-factor to function
reversible reaction
- 17. Fill in the Blank
Based on the Lock and Key hypothesis, what is represented by P?
- 18. Fill in the Blank
Where do substrate bind to enzymes?
- 19. Fill in the Blank
Based on the diagram, what will be formed when P binds to lactase?
- 20. Fill in the Blank
The graph shows the action of maltase on X to produce Y.
Name X.
- 21. Multiple Choice
The graph shows the action of maltase on X to produce Y.
Why does X and Y become constant at certain point?
active site of enzymes are saturated with X
pH is unsuitable for the reaction
temperature increases above optimal level
maltase denatures
- 22. Fill in the Blank
Name the process occured to enzymes when the optimal temperature is exceeded.
- 23. Multiple Choice
What is the criteria of the active site of enzymes that ensure them to function at narrow pH?
different charge between active site and substrate
same charge of active site and substrate
enzyme denatures during extreme pH change
all enzyme function at the same range of pH
- 24. Multiple Choice
The graph shows the action of maltase on X to produce Y.
Why does the concentration of X decreases?
concentration of substrate is constant
concentration of maltase decreases
substrate catalysed by maltase
more active site available
- 25. Multiple Choice
The graph shows the action of maltase on X to produce Y.
Why does the concentration of Y increases?
substrate catalysed by maltase into products
decrease in X increases Y
active sites are saturated
more Y is added
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